RSCG Examples

Content of the book

You will find in this book code examples about >10 Roslyn Source Code Generator (RSCG ) that can be usefull for you. That means, you will write more elegant and concise code - even if the generators code is not always nice to look.

Are those examples ready for production ?

I have done due diligence to test the RSCG that I have show to you here. However, I cannot guarantee that will fit your code . That means that you can test it for your case and, because all are open source on Github.com , you can contribute to improve them ;-)

How to read this book

For each chapter, you will find

1. Name of the RSCG and link to the NuGet package / GitHub repository
2. What the RSCG can do
3. What will be the initial code
4. How to use the Code generated by RSCG
5. Code Generated by RSCG
6. Link to the downloadable code to practice

I have a suggestion for a new RSCG that is worth mentioning in this book . What can I do ?

Please send me an email to ignatandrei@yahoo.com

I want to make a RSCG that will be useful. How can I do ?

In the introduction I have put the links to get you started with RSCG .

And, if you bought this book from Amazon , you are entitled to have 1 hour free of consultancy with me . I can help you make one.

What is a Roslyn Source Code Generator ?

A Roslyn Source Code Generator (RSCG ) is a program that generates code in the compile time, based on the previous source code and/or another data . This new source code is added to the compilation and compile with the previous source code.

How can I make a Roslyn Source Code Generator ?

For creating the RSCG you will simply create a .NET Standard 2.0 project,add those 2 references

    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.1" PrivateAssets="all" />
    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.8.0" />

and start implementing

public interface ISourceGenerator
{
    void Initialize(GeneratorInitializationContext context);
    void Execute(GeneratorExecutionContext context);
}

Start from examples at https://github.com/dotnet/roslyn-sdk/tree/main/samples/CSharp/SourceGenerators Also, you can read the source code for the RSCG presented in this book.

Show me some code for RSCG

Start read

https://github.com/dotnet/roslyn/blob/main/docs/features/source-generators.md

and

https://github.com/dotnet/roslyn/blob/main/docs/features/source-generators.cookbook.md .

After that , you can play with the examples from https://github.com/dotnet/roslyn-sdk/tree/main/samples/CSharp/SourceGenerators or from https://sourcegen.dev/ ( see AutoNotify in the dropdown )

How the RSCG can help me to write faster / better the code ?

Glad that you asked. You can see in action a RSCG for automatically generating code for automating testing ( see DynamicMocking ) , parsing enum ( see Enum ) , generating controllers actions from a interface ( SkinnyControllers ), currying functions and many more. In this book you will find more than 10 examples of some RSCG that can help you. Also, you can find the source code of the examples at https://github.com/ignatandrei/RSCG_Examples.

What can do

The ThisAssembly.Info allows you access to the Assembly Information as constants, instead of going to reflection each time. I found useful to see the assembly version right away in any project that I have.

Here is the csproj with the references

code

The code that you start with is

code

The code that you will use is

code

The code that is generated is

code

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/ApplicationVersion

All Generators: https://github.com/ignatandrei/RSCG_Examples/

What can do

This will generate code to fast parsing a int or a string to an enum

Here is the csproj with the references

code

The code that you start with is

code

The code that you will use is

code

The code that is generated is

code

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/Enum

All Generators: https://github.com/ignatandrei/RSCG_Examples/

What can do

This will generate C# classes from json files.

Here is the csproj with the references

code

The code that you start with is

code

The code that you will use is

code

The code that is generated is

code

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/JsonToClass

All Generators: https://github.com/ignatandrei/RSCG_Examples/

What can do

This will generate code for a POCO to generate copy constructor and deconstructor

Here is the csproj with the references

code

The code that you start with is

code

The code that you will use is

code

The code that is generated is

code

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/CopyConstructor

All Generators: https://github.com/ignatandrei/RSCG_Examples/

What can do

AutoMapping from a POCO to a DTO. Lots of customizations

Here is the csproj with the references

code

The code that you start with is

code

The code that you will use is

code

The code that is generated is

code

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/DTOMapper

All Generators: https://github.com/ignatandrei/RSCG_Examples/

What can do

This will generate code for WebAPI for each method of a field in the controller

Here is the csproj with the references

code

The code that you start with is

code

The code that you will use is

code

The code that is generated is

code

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/SkinnyControllers

All Generators: https://github.com/ignatandrei/RSCG_Examples/

What can do

Implements the Builder Design pattern for any class. Useful , at least, for test projects

Here is the csproj with the references

code

The code that you start with is

code

The code that you will use is

code

The code that is generated is

code

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/DP_Builder

All Generators: https://github.com/ignatandrei/RSCG_Examples/

What can do

This will generate code to retrieve the values of properties directly, not by reflection

Here is the csproj with the references

code

The code that you start with is

code

The code that you will use is

code

The code that is generated is

code

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/MetadataFromObject

All Generators: https://github.com/ignatandrei/RSCG_Examples/

What can do

This will generate Mock classes directly for any interface - with your implementation.

Here is the csproj with the references

code

The code that you start with is

code

The code that you will use is

code

The code that is generated is

code

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/DynamicMocking

All Generators: https://github.com/ignatandrei/RSCG_Examples/

What can do

This will generate code to decorate methods with anything you want ( stopwatch, logging , authorization…)

Here is the csproj with the references

code

The code that you start with is

code

The code that you will use is

code

The code that is generated is

code

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/MethodDecorator

All Generators: https://github.com/ignatandrei/RSCG_Examples/

What can do

This will generate curry for your functions

Here is the csproj with the references

code

The code that you start with is

code

The code that you will use is

code

The code that is generated is

code

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/PartiallyFunction

All Generators: https://github.com/ignatandrei/RSCG_Examples/

What can do

This will generate code to add IFormattable to any class, based on the properties of the class

Here is the csproj with the references

code

The code that you start with is

code

The code that you will use is

code

The code that is generated is

code

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/IFormattable

All Generators: https://github.com/ignatandrei/RSCG_Examples/

What can do

Implement the Design Pattern Decorator. Based on template - you can modify the source code generated

Here is the csproj with the references

code

The code that you start with is

code

The code that you will use is

code

The code that is generated is

code

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/DP_Decorator

All Generators: https://github.com/ignatandrei/RSCG_Examples/

What can do

This will generate code to add function to be used with Entity Framework to search for any property of a class

Here is the csproj with the references

code

The code that you start with is

code

The code that you will use is

code

The code that is generated is

code

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/PropertyExpressionGenerator

All Generators: https://github.com/ignatandrei/RSCG_Examples/